a shooting overnight became the city's 500th homicide of the year. police say a 40-year-old man was shot in the head outside a convenience store. no arrests were made. now, chicago has been struggling for decades to overcome an epidemic of gun violence. this year's homicide figures are 17% higher than last year. but it is still only about half the rate of 20 years ago. according to chicago police statistics, 943 homicides were recorded in 1992. >>> for the second time this month, a man has been shoved to his death from a subway platform in new york. it happened last night in queens. police and witnesses say a woman who had been pacing and mumbling pushed a man in front of the train before running down two nights of stairs and into the street. surveillance video actually caught part of that. the woman is still on the loose, and the suspect in a fatal subway shove earlier this month is in custody, charged with second-degree murder. >>> the music world is mourning the loss today of r&b singer fontella bass, best known for her 1965 hit "rescue me." ♪ r